Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode
Through analysis of remotely sensed sea surface temperature (SST) and sea ice concentration data, we investigate the impact of winds related to the Southern Annular Mode (SAM) on sea ice extent around Antarctica. We show that positive SAM anomalies in the austral summer are associated with anomalous...
Published in: | Geophysical Research Letters |
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American Geophysical Union (AGU)
2018
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ftmit:oai:dspace.mit.edu:1721.1/118471 2023-06-11T04:05:59+02:00 Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode Doddridge, Edward W Marshall, John C Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Doddridge, Edward W Marshall, John C 2018-09-26T18:17:47Z application/pdf http://hdl.handle.net/1721.1/118471 unknown American Geophysical Union (AGU) http://dx.doi.org/10.1002/2017GL074319 Geophysical Research Letters 0094-8276 http://hdl.handle.net/1721.1/118471 Doddridge, Edward W. and John Marshall. “Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode.” Geophysical Research Letters 44, 19 (October 2017): 9761–9768 © 2017 The Authors orcid:0000-0002-6097-5729 orcid:0000-0001-9230-3591 Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ Wiley Article http://purl.org/eprint/type/JournalArticle 2018 ftmit https://doi.org/10.1002/2017GL074319 2023-05-29T08:47:21Z Through analysis of remotely sensed sea surface temperature (SST) and sea ice concentration data, we investigate the impact of winds related to the Southern Annular Mode (SAM) on sea ice extent around Antarctica. We show that positive SAM anomalies in the austral summer are associated with anomalously cold SSTs that persist and lead to anomalous ice growth in the following autumn, while negative SAM anomalies precede warm SSTs and a reduction in sea ice extent during autumn. The largest effect occurs in April, when a unit change in the detrended summertime SAM is followed by a 1.8±0.6 ×10⁵ km² change in detrended sea ice extent. We find no evidence that sea ice extent anomalies related to the summertime SAM affect the wintertime sea ice extent maximum. Our analysis shows that the wind anomalies related to the negative SAM during the 2016/2017 austral summer contributed to the record minimum Antarctic sea ice extent observed in March 2017. Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice DSpace@MIT (Massachusetts Institute of Technology) Antarctic Austral Geophysical Research Letters 44 19 9761 9768 |
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DSpace@MIT (Massachusetts Institute of Technology) |
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description |
Through analysis of remotely sensed sea surface temperature (SST) and sea ice concentration data, we investigate the impact of winds related to the Southern Annular Mode (SAM) on sea ice extent around Antarctica. We show that positive SAM anomalies in the austral summer are associated with anomalously cold SSTs that persist and lead to anomalous ice growth in the following autumn, while negative SAM anomalies precede warm SSTs and a reduction in sea ice extent during autumn. The largest effect occurs in April, when a unit change in the detrended summertime SAM is followed by a 1.8±0.6 ×10⁵ km² change in detrended sea ice extent. We find no evidence that sea ice extent anomalies related to the summertime SAM affect the wintertime sea ice extent maximum. Our analysis shows that the wind anomalies related to the negative SAM during the 2016/2017 austral summer contributed to the record minimum Antarctic sea ice extent observed in March 2017. |
author2 |
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Doddridge, Edward W Marshall, John C |
format |
Article in Journal/Newspaper |
author |
Doddridge, Edward W Marshall, John C |
spellingShingle |
Doddridge, Edward W Marshall, John C Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode |
author_facet |
Doddridge, Edward W Marshall, John C |
author_sort |
Doddridge, Edward W |
title |
Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode |
title_short |
Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode |
title_full |
Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode |
title_fullStr |
Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode |
title_full_unstemmed |
Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode |
title_sort |
modulation of the seasonal cycle of antarctic sea ice extent related to the southern annular mode |
publisher |
American Geophysical Union (AGU) |
publishDate |
2018 |
url |
http://hdl.handle.net/1721.1/118471 |
geographic |
Antarctic Austral |
geographic_facet |
Antarctic Austral |
genre |
Antarc* Antarctic Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Sea ice |
op_source |
Wiley |
op_relation |
http://dx.doi.org/10.1002/2017GL074319 Geophysical Research Letters 0094-8276 http://hdl.handle.net/1721.1/118471 Doddridge, Edward W. and John Marshall. “Modulation of the Seasonal Cycle of Antarctic Sea Ice Extent Related to the Southern Annular Mode.” Geophysical Research Letters 44, 19 (October 2017): 9761–9768 © 2017 The Authors orcid:0000-0002-6097-5729 orcid:0000-0001-9230-3591 |
op_rights |
Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/2017GL074319 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
19 |
container_start_page |
9761 |
op_container_end_page |
9768 |
_version_ |
1768377700397875200 |